Creep behavior and mechanical properties of Al-Li-S4 alloy at different aging temperatures

被引：11

作者：

Zhou, Chang ^{[1
,2
]}

Zhan, Li-hua ^{[1
,2
]}

Shen, Ru-lin ^{[1
,2
]}

Zhao, Xing ^{[1
,2
]}

Yu, Hai-liang ^{[1
,2
]}

Huang, Ming-hui ^{[1
,2
]}

Li, He ^{[1
,2
]}

Yang, You-liang ^{[1
,2
]}

Hu, Li-bin ^{[1
,2
]}

Liu, De-bo ^{[3
]}

Hu, Zheng-gen ^{[3
]}

机构：

[1] Cent South Univ, State Key Lab High Performance Complex Mfg, Changsha 410083, Peoples R China

[2] Cent South Univ, Coll Mech & Elect Engn, Changsha 410083, Peoples R China

[3] Beijing Inst Aerosp Syst Engn, Beijing 100076, Peoples R China

来源：

JOURNAL OF CENTRAL SOUTH UNIVERSITY | 2020年 / 27卷 / 04期

基金：

国家重点研发计划;

关键词：

Al-Li-S4; alloy; creep behavior; mechanical properties; aging temperature; MICROSTRUCTURE; PRECIPITATION; DEFORMATION; EVOLUTION; MG;

D O I：

10.1007/s11771-020-4357-3

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

Creep age forming techniques have been widely used in aerospace industries. In this study, we investigated the effect of aging temperature (143 degrees C-163 degrees C) on the creep behavior of Al-Li-S4 aluminum alloy and their mechanical properties at room temperature. The mechanical properties were tested by tensile testing, and the microstructural evolution at different aging temperatures was examined by transmission electron microscopy. Results show that the creep strains and the room-temperature mechanical properties after creep aging increase with the aging temperature. As the aging temperature increases, the creep strain increases from 0.018% at 143 degrees C to 0.058% at 153 degrees C, and then to 0.094% at 163 degrees C. Within 25 h aging, the number of creep steps increases and the duration time of the same steps is shortened with the growth of aging temperatures. Therefore, the increase in aging temperatures accelerates the progress of the entire creep. Two main strengthening precipitates theta ' (Al2Cu) and T-1 (Al2CuLi) phases were characterized. This work indicates that the creep strain and mechanical properties of Al-Li-S4 alloys can be improved by controlling aging temperatures.

引用

页码：1168 / 1175

页数：8

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